Machine eok bending metal pipe



UNITED STATES PATENT OFFICE.

J. PERKINS AND H. BURNETT, OF NEWARK, NEW JERSEY.

MACHINE FOR IBENDING METAL PIPE.

Specification forming part of Letters Patent No. 15,899, dated October 14:, 1856; Reissued September 20, 1859, No. 814.

To all whom it may concern Be it known that W,JAMES PERKINS and WILLIAM H. BURNETT, of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Machinery for Bending Metal Pipes into Coils; and we do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing, in

which Figure 1 is a side elevation. Fig. 2 is a plan. Fig. 4 is a cross section on a line of the roller and furnace. Figs. 5 and 6, modifications for making a simple bend on a pipe. j j

The nature of our invention consists in combining a mandrel or former with a roller or guide so as to bend a heated pipe of iron or other metal either hot or cold into the form of a coil or curve without collapsing it or distorting its cross section.

The construction of one form of the apparatus shown in the drawing is as follows: I arrange a furnace a of suflicient length to heat the pipe properly while passing through it. The pipe enters the furnace through an opening and passes out through another in opposite ends of the furnace as clearly seen in Figs. 2 and 4. Just in front of the furnace we place a roller b. This roller has a semi-circular groove in it around its periphery as plainly seen at Fig. 3. In this modification the roller is in stationary bearings and just over it there is a former on a mandrel 0. The former is lettered cl. This former is made of metal and is either cylindrical or conical as shown in the Figs. 1, 2, 3. Around the exterior of this former 05 a semi-circular groove is turned spirally from end to end and the circumference is divided into quarters by radial joints parallel with its axis; a collar projects from it around the axis at 00 m which is embraced by a ring or collar 3 y. The mandrel c is made conical where it passes through the collars of the former so that by driving it in it forces the segments out till the rings bind and hold them. This mandrel and former are held in hearings in a carriage e e which moves along in front of the furnace as the coil is formed. The mandrel has a spur wheel h on it driven by a'pinion i turned by power. It may not be necessary to have the former in sections when of a cone form in order to deliver the coil of pipe therefrom, but with the cylindrical former this is necessary in most cases. The two semi-circles or grooves in the surface of the former and the roller 2') or guide form an entire circle just at the bend of the pipe, which they there completely surround and thus prevent the pipe from collapsing or becoming distorted in its cross section during the process of bending.

To put this machine into operation we take the iron or other wrought pipe to be bent, and pass it throughthe furnace and between the roller 7) and former (Z. We aflix the end of the pipe to the former and by revolving it the pipe is coiled around the former a? in the spiral form of the'groove into which it is laid. This spiral causes the carriage to advance as the pipe is wound on. When the coil is formed, the mandrel is driven back, which causes the former to collapse and the coil is then removed.

It is obvious that the former can be made stationary and the roller be made to work around it with a similar result; this is shown in Figs. 5 and 6. For making bends in pipes, the operation is so obvious it needs no further description.

We claim The mandrel substantially as herein described with the traversing roller Z) on its equivalent for bending coils of metal pipe and in combination therewith the furnace in the manner and for the purposes set forth.

JAMES PERKINS. WILLIAM H. BURNETT.

Witnesses:

W. B. SMITH, D. W. BATEMAN.

[Fmsr PRINTED 1912.] 

